1 #ifndef _LINUX_DCCP_H 2 #define _LINUX_DCCP_H 3 4 #include <linux/types.h> 5 #include <asm/byteorder.h> 6 7 /** 8 * struct dccp_hdr - generic part of DCCP packet header 9 * 10 * @dccph_sport - Relevant port on the endpoint that sent this packet 11 * @dccph_dport - Relevant port on the other endpoint 12 * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words 13 * @dccph_ccval - Used by the HC-Sender CCID 14 * @dccph_cscov - Parts of the packet that are covered by the Checksum field 15 * @dccph_checksum - Internet checksum, depends on dccph_cscov 16 * @dccph_x - 0 = 24 bit sequence number, 1 = 48 17 * @dccph_type - packet type, see DCCP_PKT_ prefixed macros 18 * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x 19 */ 20 struct dccp_hdr { 21 __be16 dccph_sport, 22 dccph_dport; 23 __u8 dccph_doff; 24 #if defined(__LITTLE_ENDIAN_BITFIELD) 25 __u8 dccph_cscov:4, 26 dccph_ccval:4; 27 #elif defined(__BIG_ENDIAN_BITFIELD) 28 __u8 dccph_ccval:4, 29 dccph_cscov:4; 30 #else 31 #error "Adjust your <asm/byteorder.h> defines" 32 #endif 33 __u16 dccph_checksum; 34 #if defined(__LITTLE_ENDIAN_BITFIELD) 35 __u8 dccph_x:1, 36 dccph_type:4, 37 dccph_reserved:3; 38 #elif defined(__BIG_ENDIAN_BITFIELD) 39 __u8 dccph_reserved:3, 40 dccph_type:4, 41 dccph_x:1; 42 #else 43 #error "Adjust your <asm/byteorder.h> defines" 44 #endif 45 __u8 dccph_seq2; 46 __be16 dccph_seq; 47 }; 48 49 /** 50 * struct dccp_hdr_ext - the low bits of a 48 bit seq packet 51 * 52 * @dccph_seq_low - low 24 bits of a 48 bit seq packet 53 */ 54 struct dccp_hdr_ext { 55 __be32 dccph_seq_low; 56 }; 57 58 /** 59 * struct dccp_hdr_request - Conection initiation request header 60 * 61 * @dccph_req_service - Service to which the client app wants to connect 62 * @dccph_req_options - list of options (must be a multiple of 32 bits 63 */ 64 struct dccp_hdr_request { 65 __be32 dccph_req_service; 66 }; 67 /** 68 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets 69 * 70 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR 71 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR 72 */ 73 struct dccp_hdr_ack_bits { 74 __be16 dccph_reserved1; 75 __be16 dccph_ack_nr_high; 76 __be32 dccph_ack_nr_low; 77 }; 78 /** 79 * struct dccp_hdr_response - Conection initiation response header 80 * 81 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR 82 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR 83 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request 84 * @dccph_resp_options - list of options (must be a multiple of 32 bits 85 */ 86 struct dccp_hdr_response { 87 struct dccp_hdr_ack_bits dccph_resp_ack; 88 __be32 dccph_resp_service; 89 }; 90 91 /** 92 * struct dccp_hdr_reset - Unconditionally shut down a connection 93 * 94 * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request 95 * @dccph_reset_options - list of options (must be a multiple of 32 bits 96 */ 97 struct dccp_hdr_reset { 98 struct dccp_hdr_ack_bits dccph_reset_ack; 99 __u8 dccph_reset_code, 100 dccph_reset_data[3]; 101 }; 102 103 enum dccp_pkt_type { 104 DCCP_PKT_REQUEST = 0, 105 DCCP_PKT_RESPONSE, 106 DCCP_PKT_DATA, 107 DCCP_PKT_ACK, 108 DCCP_PKT_DATAACK, 109 DCCP_PKT_CLOSEREQ, 110 DCCP_PKT_CLOSE, 111 DCCP_PKT_RESET, 112 DCCP_PKT_SYNC, 113 DCCP_PKT_SYNCACK, 114 DCCP_PKT_INVALID, 115 }; 116 117 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID 118 119 static inline unsigned int dccp_packet_hdr_len(const __u8 type) 120 { 121 if (type == DCCP_PKT_DATA) 122 return 0; 123 if (type == DCCP_PKT_DATAACK || 124 type == DCCP_PKT_ACK || 125 type == DCCP_PKT_SYNC || 126 type == DCCP_PKT_SYNCACK || 127 type == DCCP_PKT_CLOSE || 128 type == DCCP_PKT_CLOSEREQ) 129 return sizeof(struct dccp_hdr_ack_bits); 130 if (type == DCCP_PKT_REQUEST) 131 return sizeof(struct dccp_hdr_request); 132 if (type == DCCP_PKT_RESPONSE) 133 return sizeof(struct dccp_hdr_response); 134 return sizeof(struct dccp_hdr_reset); 135 } 136 enum dccp_reset_codes { 137 DCCP_RESET_CODE_UNSPECIFIED = 0, 138 DCCP_RESET_CODE_CLOSED, 139 DCCP_RESET_CODE_ABORTED, 140 DCCP_RESET_CODE_NO_CONNECTION, 141 DCCP_RESET_CODE_PACKET_ERROR, 142 DCCP_RESET_CODE_OPTION_ERROR, 143 DCCP_RESET_CODE_MANDATORY_ERROR, 144 DCCP_RESET_CODE_CONNECTION_REFUSED, 145 DCCP_RESET_CODE_BAD_SERVICE_CODE, 146 DCCP_RESET_CODE_TOO_BUSY, 147 DCCP_RESET_CODE_BAD_INIT_COOKIE, 148 DCCP_RESET_CODE_AGGRESSION_PENALTY, 149 }; 150 151 /* DCCP options */ 152 enum { 153 DCCPO_PADDING = 0, 154 DCCPO_MANDATORY = 1, 155 DCCPO_MIN_RESERVED = 3, 156 DCCPO_MAX_RESERVED = 31, 157 DCCPO_CHANGE_L = 32, 158 DCCPO_CONFIRM_L = 33, 159 DCCPO_CHANGE_R = 34, 160 DCCPO_CONFIRM_R = 35, 161 DCCPO_NDP_COUNT = 37, 162 DCCPO_ACK_VECTOR_0 = 38, 163 DCCPO_ACK_VECTOR_1 = 39, 164 DCCPO_TIMESTAMP = 41, 165 DCCPO_TIMESTAMP_ECHO = 42, 166 DCCPO_ELAPSED_TIME = 43, 167 DCCPO_MAX = 45, 168 DCCPO_MIN_CCID_SPECIFIC = 128, 169 DCCPO_MAX_CCID_SPECIFIC = 255, 170 }; 171 172 /* DCCP features */ 173 enum { 174 DCCPF_RESERVED = 0, 175 DCCPF_CCID = 1, 176 DCCPF_SEQUENCE_WINDOW = 3, 177 DCCPF_ACK_RATIO = 5, 178 DCCPF_SEND_ACK_VECTOR = 6, 179 DCCPF_SEND_NDP_COUNT = 7, 180 /* 10-127 reserved */ 181 DCCPF_MIN_CCID_SPECIFIC = 128, 182 DCCPF_MAX_CCID_SPECIFIC = 255, 183 }; 184 185 /* this structure is argument to DCCP_SOCKOPT_CHANGE_X */ 186 struct dccp_so_feat { 187 __u8 dccpsf_feat; 188 __u8 *dccpsf_val; 189 __u8 dccpsf_len; 190 }; 191 192 /* DCCP socket options */ 193 #define DCCP_SOCKOPT_PACKET_SIZE 1 194 #define DCCP_SOCKOPT_SERVICE 2 195 #define DCCP_SOCKOPT_CHANGE_L 3 196 #define DCCP_SOCKOPT_CHANGE_R 4 197 #define DCCP_SOCKOPT_CCID_RX_INFO 128 198 #define DCCP_SOCKOPT_CCID_TX_INFO 192 199 200 #define DCCP_SERVICE_LIST_MAX_LEN 32 201 202 #ifdef __KERNEL__ 203 204 #include <linux/in.h> 205 #include <linux/list.h> 206 #include <linux/uio.h> 207 #include <linux/workqueue.h> 208 209 #include <net/inet_connection_sock.h> 210 #include <net/inet_sock.h> 211 #include <net/inet_timewait_sock.h> 212 #include <net/tcp_states.h> 213 214 enum dccp_state { 215 DCCP_OPEN = TCP_ESTABLISHED, 216 DCCP_REQUESTING = TCP_SYN_SENT, 217 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME: 218 This mapping is horrible, but TCP has 219 no matching state for DCCP_PARTOPEN, 220 as TCP_SYN_RECV is already used by 221 DCCP_RESPOND, why don't stop using TCP 222 mapping of states? OK, now we don't use 223 sk_stream_sendmsg anymore, so doesn't 224 seem to exist any reason for us to 225 do the TCP mapping here */ 226 DCCP_LISTEN = TCP_LISTEN, 227 DCCP_RESPOND = TCP_SYN_RECV, 228 DCCP_CLOSING = TCP_CLOSING, 229 DCCP_TIME_WAIT = TCP_TIME_WAIT, 230 DCCP_CLOSED = TCP_CLOSE, 231 DCCP_MAX_STATES = TCP_MAX_STATES, 232 }; 233 234 #define DCCP_STATE_MASK 0xf 235 #define DCCP_ACTION_FIN (1<<7) 236 237 enum { 238 DCCPF_OPEN = TCPF_ESTABLISHED, 239 DCCPF_REQUESTING = TCPF_SYN_SENT, 240 DCCPF_PARTOPEN = TCPF_FIN_WAIT1, 241 DCCPF_LISTEN = TCPF_LISTEN, 242 DCCPF_RESPOND = TCPF_SYN_RECV, 243 DCCPF_CLOSING = TCPF_CLOSING, 244 DCCPF_TIME_WAIT = TCPF_TIME_WAIT, 245 DCCPF_CLOSED = TCPF_CLOSE, 246 }; 247 248 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) 249 { 250 return (struct dccp_hdr *)skb->h.raw; 251 } 252 253 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb) 254 { 255 return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr)); 256 } 257 258 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) 259 { 260 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); 261 } 262 263 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) 264 { 265 const struct dccp_hdr *dh = dccp_hdr(skb); 266 return __dccp_basic_hdr_len(dh); 267 } 268 269 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb) 270 { 271 const struct dccp_hdr *dh = dccp_hdr(skb); 272 __u64 seq_nr = ntohs(dh->dccph_seq); 273 274 if (dh->dccph_x != 0) 275 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low); 276 else 277 seq_nr += (u32)dh->dccph_seq2 << 16; 278 279 return seq_nr; 280 } 281 282 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) 283 { 284 return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb)); 285 } 286 287 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) 288 { 289 return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb)); 290 } 291 292 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) 293 { 294 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); 295 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low); 296 } 297 298 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) 299 { 300 return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb)); 301 } 302 303 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) 304 { 305 return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb)); 306 } 307 308 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) 309 { 310 return __dccp_basic_hdr_len(dh) + 311 dccp_packet_hdr_len(dh->dccph_type); 312 } 313 314 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) 315 { 316 return __dccp_hdr_len(dccp_hdr(skb)); 317 } 318 319 320 /* initial values for each feature */ 321 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100 322 #define DCCPF_INITIAL_ACK_RATIO 2 323 #define DCCPF_INITIAL_CCID 2 324 #define DCCPF_INITIAL_SEND_ACK_VECTOR 1 325 /* FIXME: for now we're default to 1 but it should really be 0 */ 326 #define DCCPF_INITIAL_SEND_NDP_COUNT 1 327 328 #define DCCP_NDP_LIMIT 0xFFFFFF 329 330 /** 331 * struct dccp_minisock - Minimal DCCP connection representation 332 * 333 * Will be used to pass the state from dccp_request_sock to dccp_sock. 334 * 335 * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2) 336 * @dccpms_ccid - Congestion Control Id (CCID) (section 10) 337 * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5) 338 * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2) 339 */ 340 struct dccp_minisock { 341 __u64 dccpms_sequence_window; 342 __u8 dccpms_rx_ccid; 343 __u8 dccpms_tx_ccid; 344 __u8 dccpms_send_ack_vector; 345 __u8 dccpms_send_ndp_count; 346 __u8 dccpms_ack_ratio; 347 struct list_head dccpms_pending; 348 struct list_head dccpms_conf; 349 }; 350 351 struct dccp_opt_conf { 352 __u8 *dccpoc_val; 353 __u8 dccpoc_len; 354 }; 355 356 struct dccp_opt_pend { 357 struct list_head dccpop_node; 358 __u8 dccpop_type; 359 __u8 dccpop_feat; 360 __u8 *dccpop_val; 361 __u8 dccpop_len; 362 int dccpop_conf; 363 struct dccp_opt_conf *dccpop_sc; 364 }; 365 366 extern void __dccp_minisock_init(struct dccp_minisock *dmsk); 367 extern void dccp_minisock_init(struct dccp_minisock *dmsk); 368 369 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb); 370 371 struct dccp_request_sock { 372 struct inet_request_sock dreq_inet_rsk; 373 __u64 dreq_iss; 374 __u64 dreq_isr; 375 __be32 dreq_service; 376 }; 377 378 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) 379 { 380 return (struct dccp_request_sock *)req; 381 } 382 383 extern struct inet_timewait_death_row dccp_death_row; 384 385 struct dccp_options_received { 386 u32 dccpor_ndp; /* only 24 bits */ 387 u32 dccpor_timestamp; 388 u32 dccpor_timestamp_echo; 389 u32 dccpor_elapsed_time; 390 }; 391 392 struct ccid; 393 394 enum dccp_role { 395 DCCP_ROLE_UNDEFINED, 396 DCCP_ROLE_LISTEN, 397 DCCP_ROLE_CLIENT, 398 DCCP_ROLE_SERVER, 399 }; 400 401 struct dccp_service_list { 402 __u32 dccpsl_nr; 403 __be32 dccpsl_list[0]; 404 }; 405 406 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) 407 408 static inline int dccp_list_has_service(const struct dccp_service_list *sl, 409 const __be32 service) 410 { 411 if (likely(sl != NULL)) { 412 u32 i = sl->dccpsl_nr; 413 while (i--) 414 if (sl->dccpsl_list[i] == service) 415 return 1; 416 } 417 return 0; 418 } 419 420 struct dccp_ackvec; 421 422 /** 423 * struct dccp_sock - DCCP socket state 424 * 425 * @dccps_swl - sequence number window low 426 * @dccps_swh - sequence number window high 427 * @dccps_awl - acknowledgement number window low 428 * @dccps_awh - acknowledgement number window high 429 * @dccps_iss - initial sequence number sent 430 * @dccps_isr - initial sequence number received 431 * @dccps_osr - first OPEN sequence number received 432 * @dccps_gss - greatest sequence number sent 433 * @dccps_gsr - greatest valid sequence number received 434 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss 435 * @dccps_timestamp_time - time of latest TIMESTAMP option 436 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option 437 * @dccps_packet_size - Set thru setsockopt 438 * @dccps_role - Role of this sock, one of %dccp_role 439 * @dccps_ndp_count - number of Non Data Packets since last data packet 440 * @dccps_hc_rx_ackvec - rx half connection ack vector 441 */ 442 struct dccp_sock { 443 /* inet_connection_sock has to be the first member of dccp_sock */ 444 struct inet_connection_sock dccps_inet_connection; 445 __u64 dccps_swl; 446 __u64 dccps_swh; 447 __u64 dccps_awl; 448 __u64 dccps_awh; 449 __u64 dccps_iss; 450 __u64 dccps_isr; 451 __u64 dccps_osr; 452 __u64 dccps_gss; 453 __u64 dccps_gsr; 454 __u64 dccps_gar; 455 __be32 dccps_service; 456 struct dccp_service_list *dccps_service_list; 457 struct timeval dccps_timestamp_time; 458 __u32 dccps_timestamp_echo; 459 __u32 dccps_packet_size; 460 __u16 dccps_l_ack_ratio; 461 __u16 dccps_r_ack_ratio; 462 unsigned long dccps_ndp_count; 463 __u32 dccps_mss_cache; 464 struct dccp_minisock dccps_minisock; 465 struct dccp_ackvec *dccps_hc_rx_ackvec; 466 struct ccid *dccps_hc_rx_ccid; 467 struct ccid *dccps_hc_tx_ccid; 468 struct dccp_options_received dccps_options_received; 469 struct timeval dccps_epoch; 470 enum dccp_role dccps_role:2; 471 __u8 dccps_hc_rx_insert_options:1; 472 __u8 dccps_hc_tx_insert_options:1; 473 }; 474 475 static inline struct dccp_sock *dccp_sk(const struct sock *sk) 476 { 477 return (struct dccp_sock *)sk; 478 } 479 480 static inline struct dccp_minisock *dccp_msk(const struct sock *sk) 481 { 482 return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock; 483 } 484 485 static inline int dccp_service_not_initialized(const struct sock *sk) 486 { 487 return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE; 488 } 489 490 static inline const char *dccp_role(const struct sock *sk) 491 { 492 switch (dccp_sk(sk)->dccps_role) { 493 case DCCP_ROLE_UNDEFINED: return "undefined"; 494 case DCCP_ROLE_LISTEN: return "listen"; 495 case DCCP_ROLE_SERVER: return "server"; 496 case DCCP_ROLE_CLIENT: return "client"; 497 } 498 return NULL; 499 } 500 501 #endif /* __KERNEL__ */ 502 503 #endif /* _LINUX_DCCP_H */ 504
